Geodesic
On the residual nilpotence of free products of free groups with cyclic amalgamation
Matematičeskie zametki, Tome 64 (1998) no. 1, pp. 3-8.

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Let $G$ be a free product of free groups with cyclic amalgamation. In this note we prove a criterion for the group $G$ to be a residually finite $p$-group. Other residual properties of the group $G$ are also established. 
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D. N. Azarov. On the residual nilpotence of free products of free groups with cyclic amalgamation. Matematičeskie zametki, Tome 64 (1998) no. 1, pp. 3-8. http://geodesic.mathdoc.fr/item/MZM_1998_64_1_a0/

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